is Select the equation that shows that the kinetic energy of a 3.0-kg book tossed across...
Part A Select the equation that shows that when a 3.0-kg book is lifted 1.0 m, its increase in gravitational potential energy is 30 J O PE vmgh 0 PE=mg O PE=mgh 2 Submit Next > Provide Feedback
A 0.49-kg particle has a speed of 3.0 m/s at point A and kinetic energy of 7.7 J at point B. (a) What is its kinetic energy at A? J (b) What is its speed at point B? m/s (c) What is the total work done on the particle as it moves from A to B? J
Part A Select the equation that shows that the gravitational potential energy of a 1300-kg boulder raised 4 m above ground level is 52000 J. (You can express g in units of N/kg, because m/s? is equivalent to N/kg) mgh = (1300 kg)(10N/kg) (4 m)-52000 J 2 2 421) N2000J 0 PE-yMgh-V(1300kg)(10N/kg)(4m) o PE-mg-(1300 kg)(10 N/kg) (4 m) 52000 J PE = mgh = (1300 kg)(10 N/kg)(4 m) = 52000 J Submit Provide Feedback Next >
Calculate the mechanical energy and final speed of a 1.1 kg ball tossed at 17.3 m/s from the top of a 45.2 m high building. KE + PE = J Vf = m/s
Part A Select the equation that shows that a 1500000-J change in kinetic energy occurs for an airplane that is moved 300 m in takeoff by a sustained force of 5000 N. o W AKE F/d (5000 N)/(300 m) 1500000 J O w- AKE Fd2 (5000 N) (300 m)2 1500000 J o W AKE- Fd (5000 N) (300 m) 1500000J O W AKE 2Fd 2(5000 N)(300 m) 1500000 J Submit Provide Feedback Next >
We learned in class that the kinetic energy (KE) of an object with mass m moving at velocity v is KE =½ m v^2. Accordingly, the kinetic energy (KE) per unit mass (m) of a body moving at velocity v is KE/m=v^2 /2. What is the asteroid’s kinetic energy per unit mass (J/kg) for an impact at this velocity? State your answer in units of J/kg. velocity is 29.8 km/s
A person pulls on a 9.3 kg crate as it slides across a level floor with coefficient of kinetic friction 0.5 using a rope attached to the center of the crate. The crate began with a speed of 1.6 m/s and speeded up to 2.7 m/s while being pulled a horizontal distance of 2.0 meters. What is the net change in the kinetic energy in J of this crate during that period?
A 1.0-kg ball with a speed of 3.0 m/s strikes a 2.0-kg stationary ball. The collision is completely inelastic. (a) Calculate the speed of the balls after collision. (b) Calculate the total kinetic energy change during the collision
11. The kinetic energy of an 80-kg object moving at 10 m/s is 2000 J 4000 J 6000 J 100 J 1000 J 12. The kilowatt-hour is a unit of speed power force momentum energy 13. Energy sources used today (in the U.S.) are, mostly, from: hydroelectric dams solar panels nuclear power stations geothermal sources fossil fuels 14. What is the velocity of a 30-kg box with a kinetic energy of 6,000 J? 64 m/s 6.0 m/s 18 m/s 20...
A particle with kinetic energy equal to 322 J has a momentum of magnitude 29.7 kg · m/s. Calculate the speed (in m/s) and the mass (in kg) of the particle. speed......... m/s mass ........kg